1366 - Incorrect integer value: '' for column 'customer_id' at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', 's85acj7set789jpghopna2k7e0', '54.198.212.30', '1539878234', '1539878234', '/catalog/product_info.php?cPath=48_62&products_id=153&osCsid=8n4vco4jpoed68pv4vlsvfr2j5')

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